1.copy ****.zip to root folder of the phone SD card (no need to unzip).
2.Turn off the phone, then keep pressing power button and volume+ button until the robot icon appear, then press power button again
3.Press the volume- to move up and down to choose“wipe data/factory reset”, then press volume+ button to confirm.
4.Choose “yes—delete all user data”, then press volume+ button to enter the page as below.
5.It will enter below page after finishing delete all user data.
6.Then choose“apply update from sdcard”
7.Find and select the ROM, press volume+ to enter the page as below.
8.Please make sure the power is sufficient during the upgrading. It will showed as below when the upgrading finished.
9.Choose “reboot system now”,then press volume+ button to reboot your phone.